| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas detector capable of suppressing deterioration of a measurement accuracy by suppressing a drift of a temperature coefficient due to a temporal change of a thermosensitive resistor element, thereby performing a stable measurement.SOLUTION: A gas detector includes: a detection part 30 for detecting the temperature according to the concentration of a measurement object gas and the atmospheric temperature by using thermosensitive resistor elements 3 and 4; a compensation part 31 for detecting the atmospheric temperature by using the thermosensitive resistor elements; a first changeover switch 11 for switching the transmission of an output voltage from the detection part to a first buffer circuit 15; a second changeover switch 12 for switching the transmission of the output voltage from the compensation part to a second buffer circuit 16; an A/D converter 18 for converting the output voltages from the detection part 30 and the compensation part 31 into digital values; and an MPU 20 for reading the values digitally converted by the A/D converter 18 and performing calculation process. In the MPU 20, temperature coefficient compensation is performed according to variation of differences of the output voltages from the detection part 30 and the compensation part 31 so as to calculate a specific gas concentration.SELECTED DRAWING: Figure 1 |
